Watering tray kit give your growing seedlings a even availability of water with these watering tray kit which includes 2 trays with capillary matting sheets it can be re used season after season and can be used with 18 or 40 pot growing trays water tray kit set of 2 trays includes capillary matting sheets use with 18 or 40 pot growing trays re useable ensures even availability of water